Your Odds of Conceiving at Every Point in Your Cycle

While it's unlikely, pregnancy during menstruation is possible in certain circumstances. Since ovulation typically occurs about 14 days before your next period, most women are too far from ovulation during their period for conception to occur. However, if you have a shorter cycle or irregular periods, sperm can survive long enough to fertilize an egg after your period ends, so protection is still recommended if you're not trying to conceive.

Sperm can survive for up to 5 days in the cervical mucus of the female reproductive tract, which is why the 5-day window before ovulation is considered your fertile window. This extended lifespan is one reason why having sex several days before ovulation increases your chances of conception. After ovulation occurs, the cervical environment becomes less favorable for sperm survival.

The most reliable ovulation tracking methods include ovulation predictor kits (which detect the LH surge), monitoring changes in cervical mucus consistency, and tracking basal body temperature (which rises about 0.5 degrees Fahrenheit after ovulation). Many fertility apps combine these methods for more accurate predictions. According to the American Society for Reproductive Medicine (ASRM), combining multiple tracking methods increases accuracy compared to relying on a single indicator.

You can conceive for approximately 12-24 hours after ovulation occurs, since eggs survive for only about 12 hours once released. After this window closes, pregnancy is not possible until your next cycle begins. This is why timing intercourse around ovulation—rather than after it—gives you the best chances of conception.

The American Society for Reproductive Medicine recommends having sex every other day during your fertile window, starting about a week before expected ovulation (around day 7 of your cycle). This frequency allows adequate sperm production while covering the entire 5-day fertile window. Daily intercourse is not necessary and may actually reduce sperm count, so every-other-day timing is considered optimal for conception.

Basal body temperature (BBT) is your lowest body temperature, measured immediately upon waking before any activity. Your BBT rises by about 0.5 degrees Fahrenheit after ovulation due to increased progesterone, serving as a reliable indicator that ovulation has occurred. However, BBT tracking works best retrospectively to confirm ovulation has happened, so it's often combined with other methods like ovulation predictor kits for predicting fertile days in advance.

Yes, even with irregular cycles, ovulation can be predicted using ovulation predictor kits, cervical mucus monitoring, or basal body temperature tracking, though prediction may be more challenging. If your cycles vary significantly in length, working with a fertility specialist or using a fertility app designed for irregular cycles can help you identify patterns. Many women with irregular cycles successfully conceive by using these tracking methods rather than relying on calendar-based predictions alone.